The bug
The new Minecraft command parser does not check for int-overflows in command arguments. This causes the game to instantly freeze as soon as the command is executed.
How to reproduce
Execute the command
/tp ~ 9223372036854775807 ~Notice that the game freezes
Trying to rejoin the world instantly kicks the player with the message "Invalid move player packet received".
Environment
Operating system : Windows 10 Home Single Language x64
Java Version : Java 8 update 144
Launcher Profile Options : Default
This is an issue.